WARNING: IF YOU WISH IN THE FUTURE FOR 'HOMEBREW' & 'EMULATORS', ON YOUR SWITCH, DON'T UPDATE PASS v3.0.0!
The previously known sm:h (aka smhax) bug for Switch which was being exploited privately by a selected few is now plugged in Switch firmware v3.0.1 and made public for that reason. The bug which exist in firmware v3.0.0 and below allows for access/registration/unregistration to/of any arbitrary service with full permissions if the user creates a new 'sm:' port session but bypasses API initialization.
OFFICIAL SOURCE: --> https://twitter.com/SciresM/status/898210175013834754
NEWS SOURCE: Switch smhax plugged in firmware v3.0.1 (via) EurAsia